Seems legit. I can think of a few ways to give combat advice without sharing a language. A sharp whistle or shout to warn of danger or call attention to an opening doesn't require much of a vocabulary.

Bardic Performance If a bardic performance has audible components, the targets must be able to hear the bard for the performance to have any effect, and many such performances are language dependent (as noted in the description).

AoN wrote:

Bardic Performance If a bardic performance has audible components, the targets must be able to hear the bard for the performance to have any effect, and such performances are language dependent.

PRD wrote:

Bardic Performance If a bardic performance has audible components, the targets must be able to hear the bard for the performance to have any effect, and many such performances are language dependent (as noted in the description).

Seems the legacy PRD and the SRD state many such and refer to the descriptions, while AoN states such.

Bardic Performance If a bardic performance has audible components, the targets must be able to hear the bard for the performance to have any effect, and many such performances are language dependent (as noted in the description).

AoN wrote:

Bardic Performance If a bardic performance has audible components, the targets must be able to hear the bard for the performance to have any effect, and such performances are language dependent.

PRD wrote:

Bardic Performance If a bardic performance has audible components, the targets must be able to hear the bard for the performance to have any effect, and many such performances are language dependent (as noted in the description).

Seems the legacy PRD and the SRD state many such and refer to the descriptions, while AoN states such.